The information contained on this page was adapted from Maryland Geological Survey's Geologic
Map of Maryland (1968). This information reflects geologic interpretations from over
20 years ago and do not necessarily represent an accurate interpretation of currently accepted
geologic theory. We present this information for historic purposes only. Do not use this information
for anything other than illustrative purposes. When a corrected and updated geologic map of
Maryland is available you will see a notification on our web site.